Have it nearly a year and it is very good.
The app is nice and updates came regularly.
I also use Fiio BTR3 and ifi xDSD.
All 3 are very good solutions in they're pricerange.
I use ES100 balanced with IEMs and Headphones like Sennheiser 660s/58x
Or
single ended Beyerdynamic DT1990 Pro or 770 Pro and AKG 701.